Exhaust gas catalytic device
By setting an annular concave and convex structures in the expansion section, the problem of direct impact of exhaust gas on the catalyst holding material is solved, thereby achieving protection of the catalyst holding material and improving purification efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-07
AI Technical Summary
Exhaust gas can easily flow through the expansion section between the catalyst holding material and the catalyst shell, causing the catalyst holding material to deteriorate due to the impact of the exhaust gas.
The expansion section is equipped with annular concave and convex structures to prevent exhaust gas from flowing directly to the catalyst holding material between the catalyst and the catalyst shell. The annular concave and convex design slows down the exhaust gas flow rate and generates vortices to prevent exhaust gas from directly impacting the catalyst holding material.
It effectively prevents the deterioration of catalyst materials, extends their service life, reduces the direct impact of exhaust gas on the catalyst, and improves the purification efficiency of the catalyst.
Smart Images
Figure CN224093466U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a catalytic device, and especially relates to a waste gas catalytic device. BACKGROUND
[0002] Since the past, efforts for the purpose of moderating climate change or mitigating the influence have been continued, and research and development related to a waste gas catalytic device are being conducted in order to achieve the purpose. In the case of a waste gas catalytic device installed at an engine exhaust outlet of a vehicle, a catalytic converter of the waste gas catalytic device is connected to a cylinder of the engine through a tapered member, and since a diameter of an expansion portion connected between the tapered member and a catalyst housing expands in a direction toward the catalyst, waste gas easily flows along the expansion portion toward a catalyst holding material provided between the catalyst and the catalyst housing, causing the catalyst holding material to be deteriorated by the impact of the waste gas. Therefore, it is necessary to improve the waste gas catalytic device to overcome the above problems. SUMMARY
[0003] The utility model relates to a waste gas catalytic device, which can avoid the deterioration of the catalyst holding material caused by the impact of the waste gas.
[0004] According to the embodiment of the utility model, the waste gas catalytic device comprises: a catalytic converter, comprising a catalyst housing for accommodating a catalyst; a tapered member comprising a curved portion, one end of the curved portion having a flange portion, the curved portion being connected to an exhaust outlet of an engine body through the flange portion, the other end of the curved portion guiding waste gas from the exhaust outlet to the catalyst; and an expansion portion, one end of the expansion portion being connected to the curved portion, the other end of the expansion portion being connected to the catalyst housing, the diameter of the expansion portion expanding in a direction toward the catalyst, the outer periphery of the expansion portion having an annular recess, the annular recess protruding in a direction toward the catalyst.
[0005] In the embodiment according to the utility model, the expansion portion has a convex portion protruding upward on the upstream side of the annular recess.
[0006] In the embodiment according to the utility model, the convex portion has a vertical wall portion located at the connection position of the convex portion and the annular recess, and the waste gas flows toward the vertical wall portion.
[0007] In the embodiment according to the utility model, the convex portion is arranged along the annular recess at least in the range of the expansion portion facing the exhaust outlet.
[0008] In the embodiment according to the utility model, the convex portion extends from upstream to downstream at least in the range of the expansion portion facing the exhaust outlet, and the convex portion comprises one or more convex portions.
[0009] In the embodiment according to the utility model, the bending part is bent at a right angle or an acute angle.
[0010] Based on the above, in the exhaust gas catalytic device of the utility model, the expansion part is provided with a ring-shaped recess protruding in the direction of the catalyst, and the flow of the exhaust gas to the outside of the expansion part can be prevented through the ring-shaped recess, and further the exhaust gas is prevented from directly flowing to the catalyst holding material provided between the catalyst and the catalyst housing. Therefore, the exhaust gas catalytic device of the utility model can avoid the deterioration of the catalyst holding material caused by the impact of the exhaust gas on the catalyst holding material. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a sectional view of the exhaust gas catalytic device of an embodiment of the utility model connected to the exhaust gas outlet of the engine body;
[0012] Figure 2 is a sectional view of the exhaust gas catalytic device of an embodiment of the utility model connected to the exhaust gas outlet of the engine body; Figure 1
[0013] Figure 3 is a sectional view of the exhaust gas catalytic device of an embodiment of the utility model connected to the exhaust gas outlet of the engine body.
[0014] Figure 4 is a sectional view of the exhaust gas catalytic device of an embodiment of the utility model connected to the exhaust gas outlet of the engine body.
[0015] BRIEF DESCRIPTION OF DRAWINGS
[0016] 100: exhaust gas catalytic device;
[0017] 110: catalytic converter;
[0018] 112: catalyst housing;
[0019] 112a: catalyst;
[0020] 112b: catalyst holding material;
[0021] 120: conical member;
[0022] 122: bending part;
[0023] 122a: flange part;
[0024] 130: expansion part;
[0025] 132: ring-shaped recess;
[0026] 134, 134', 134'': convex part;
[0027] 134a: longitudinal wall part;
[0028] 50: exhaust gas outlet;
[0029] A: central axis;
[0030] F: exhaust gas;
[0031] V: vortex;
[0032] X, Y, Z: axial direction. DETAILED DESCRIPTION
[0033] Reference will now be made in detail to the exemplary embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
[0034] Figure 1 is a cross-sectional view of an exhaust gas catalytic device of an embodiment of the present application connected to an exhaust gas outlet of an engine body, showing the axial directions X, Y, Z. Figure 2 is Figure 1 a perspective view of a partial structure of the exhaust gas catalytic device of Figure 1 and Figure 2 The exhaust gas catalytic device 100 of the present embodiment includes a catalytic converter 110, a tapered member 120, and a diverging portion 130. The catalytic converter 110 includes a catalyst housing 112 to house a catalyst 112a. The tapered member 120 includes a curved portion 122 curved at a right angle or an acute angle, one end of the curved portion 122 having a flange portion 122a. The curved portion 122 is connected to the exhaust gas outlet 50 of the engine body via the flange portion 122a. One end of the diverging portion 130 is connected to the curved portion 122, and the other end of the diverging portion 130 is connected to the catalyst housing 112, the diverging portion 130 diverging in diameter in the direction toward the catalyst 112a (the reverse direction of the axial direction Z).
[0035] The catalyst 112a is to purify components in the exhaust gas. The exhaust gas F from the cylinder of the engine body enters the tapered member 120 via the exhaust gas outlet 50, and reaches the catalytic converter 110 via the diverging portion 130, and is discharged after being purified by the catalyst 112a inside the catalyst housing 112. The detailed operation of the cylinder of the engine of the vehicle and the detailed operation of the catalytic converter 110 are known in the art, and are not described here.
[0036] In the present embodiment, the outer periphery of the diverging portion 130 has a ring-shaped recessed portion 132 surrounding the central axis A of the diverging portion 130, the ring-shaped recessed portion 132 protruding in the direction toward the catalyst 112a (the reverse direction of the axial direction Z). Specifically, when viewed from the direction of the arrow A in Figure 1When the expansion portion 130 is viewed from above (i.e., the expansion portion 130 is viewed in a direction from the catalyst 112a toward the expansion portion 130), the annular recessed portion 132 of the expansion portion 130 is a concave structure that is recessed downward. When the expansion portion 130 is viewed from below (i.e., the expansion portion 130 is viewed in a direction from the expansion portion 130 toward the catalyst 112a), the annular recessed portion 132 of the expansion portion 130 is a convex structure that is protruded downward. Figure 1 When the expansion portion 130 is viewed from above (i.e., the expansion portion 130 is viewed in a direction from the catalyst 112a toward the expansion portion 130), the annular recessed portion 132 of the expansion portion 130 is a concave structure that is recessed downward. When the expansion portion 130 is viewed from below (i.e., the expansion portion 130 is viewed in a direction from the expansion portion 130 toward the catalyst 112a), the annular recessed portion 132 of the expansion portion 130 is a convex structure that is protruded downward.
[0037] As described above, in the exhaust gas catalytic device 100 of the present embodiment, the expansion portion 130 is provided with the annular recessed portion 132 that is protruded in a direction toward the catalyst 112a, and the annular recessed portion 132 can prevent the exhaust gas F from flowing to the outside of the expansion portion 130, and thus can prevent the exhaust gas F from directly flowing to the catalyst holding material 112b that is provided between the catalyst 112a and the catalyst housing 112. Accordingly, the exhaust gas catalytic device 100 of the present embodiment can prevent the catalyst holding material 112b from being deteriorated by the exhaust gas F.
[0038] Further, in the present embodiment, the expansion portion 130 is provided with a convex portion 134 that is protruded upward on an upstream side of the annular recessed portion 132. Specifically, when the expansion portion 130 is viewed from above (i.e., the expansion portion 130 is viewed in a direction from the catalyst 112a toward the expansion portion 130), the convex portion 134 of the expansion portion 130 is a convex structure that is protruded upward. When the expansion portion 130 is viewed from below (i.e., the expansion portion 130 is viewed in a direction from the expansion portion 130 toward the catalyst 112a), the convex portion 134 of the expansion portion 130 is a concave structure that is recessed upward. Figure 1 Figure 1 Further, in the present embodiment, the expansion portion 130 is provided with a convex portion 134 that is protruded upward on an upstream side of the annular recessed portion 132. Specifically, when the expansion portion 130 is viewed from above (i.e., the expansion portion 130 is viewed in a direction from the catalyst 112a toward the expansion portion 130), the convex portion 134 of the expansion portion 130 is a convex structure that is protruded upward. When the expansion portion 130 is viewed from below (i.e., the expansion portion 130 is viewed in a direction from the expansion portion 130 toward the catalyst 112a), the convex portion 134 of the expansion portion 130 is a concave structure that is recessed upward.
[0039] As described above, the convex portion 134 that is protruded upward is provided on the upstream side of the annular recessed portion 132, and the exhaust gas F that flows to the outside of the expansion portion 130 can be guided into the inside of the convex portion 134 by the convex portion 134, so that the flow rate of the exhaust gas F that flows outward can be reduced. Further, as described above, when the exhaust gas F that impinges on the annular recessed portion 132 flows to the convex portion 134, a counterclockwise vortex flow V can be generated, so that the exhaust gas F can be further prevented from flowing to the outside of the expansion portion 130, and the exhaust gas F can be effectively caused to impinge on the entire catalyst 112a. Figure 1
[0040] Specifically, the convex portion 134 of the present embodiment has a vertical wall portion 134a that is located at a connecting position of the convex portion 134 and the annular recessed portion 132 and through which the exhaust gas F flows. Specifically, the vertical wall portion 134a extends, for example, in a direction from the expansion portion 130 toward the catalyst 112a (a direction parallel to the axial direction Z). According to this, the exhaust gas F can be effectively prevented from flowing to the outside of the expansion portion 130 and the vortex flow V can be effectively generated by the vertical wall portion 134a.
[0041] Figure 3 is a partial structure of the exhaust gas catalytic device according to another embodiment of the present application. Figure 3 the embodiment shown in Figure 2 the embodiment shown in Figure 3 The protrusions 134' of the embodiment shown in Figure 1 are arranged along the annular recess 132 at least in the range of the expansion portion 130 facing the exhaust gas outlet 50 (shown in Figure 1 ). As described above, the protrusions 134' are arranged along the annular recess 132 in the region facing the exhaust gas outlet 50 (i.e. the region through which the exhaust gas easily flows), so that the exhaust gas is prevented from flowing to the outside of the expansion portion 130 in this region, thereby effectively promoting the exhaust gas to impact the entire catalyst 112a (shown in
[0042] Figure 4 is a partial structure of the exhaust gas catalytic device according to another embodiment of the present application. Figure 4 the embodiment shown in Figure 2 the embodiment shown in Figure 4 The protrusions 134" of the embodiment shown in Figure 1 are arranged along the annular recess 132 at least in the range of the expansion portion 130 facing the exhaust gas outlet 50 (shown in Figure 2 ) in the direction from the upstream of the exhaust gas flow path to the downstream of the exhaust gas flow path. As described above, the protrusions 134" are arranged along the annular recess 132 in the region facing the exhaust gas outlet 50 (i.e. the region through which the exhaust gas easily flows), so that the exhaust gas is prevented from flowing to the outside of the expansion portion 130 in this region, thereby effectively promoting the exhaust gas to impact the entire catalyst 112a (shown in Figure 4 ) compared with the embodiment shown in Figure 3 ) compared with the embodiment shown in Figure 4 the embodiment shown in Figure 1 , the vortex V of the embodiment shown in
[0043] In summary, in the exhaust gas catalytic device according to the present application, the expansion portion is provided with the annular recess protruding in the direction of the catalyst, so that the exhaust gas is prevented from flowing to the outside of the expansion portion by the annular recess, and further prevented from directly flowing to the catalyst holding material provided between the catalyst and the catalyst housing. Thus, the exhaust gas catalytic device according to the present application can avoid the deterioration of the catalyst holding material caused by the impact of the exhaust gas on the catalyst holding material.
[0044] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A waste gas catalytic device, characterized in that, include: A catalytic converter includes a catalyst housing for containing a catalyst; A tapered member includes a curved portion, one end of which has a flange portion, the curved portion being connected to the exhaust outlet of the engine body via the flange portion, and the other end of the curved portion guiding exhaust gas from the exhaust outlet to the catalyst; as well as An expansion section, one end of which is connected to the curved section, and the other end of which is connected to the catalyst housing, the diameter of which expands in the direction toward the catalyst. The outer periphery of the expansion portion has an annular recess that protrudes in the direction toward the catalyst.
2. The waste gas catalytic converter according to claim 1, characterized in that, The expansion portion has a protrusion that protrudes upward on the upstream side of the annular recess.
3. The waste gas catalytic device according to claim 2, characterized in that, The protrusion has a longitudinal wall portion, which is located at the connection between the protrusion and the annular recess, and the exhaust gas flows toward the longitudinal wall portion.
4. The waste gas catalytic converter according to claim 2, characterized in that, The protrusion is provided along the annular recess at least within the range of the expansion portion facing the exhaust gas outlet.
5. The waste gas catalytic device according to claim 2, characterized in that, The protrusion extends from upstream to downstream at least within the range of the expansion portion facing the exhaust outlet, and the protrusion includes one or more protrusions.
6. The waste gas catalytic device according to claim 1, characterized in that, The curved portion bends at a right angle or an acute angle.